File



Feb' l 1927 H. B. woMAcK FILE Filed' Jan. 25. 1925 IWT/VESSES M4TTORA'EY.

Patented F eb. 1, 1927. e

HENRY WOMACK, OF BIRMINGHAM, ALABAMA.

FILE.

Application filed January 23, 1926. Serial No. 83,344. I

The present invention relates to improvements in files and has for itsprime obJect to provide a file especially designed for filing the bladesof shears and like implements.

I A further object of'the invention is theA provision of a fileconstructed so. as te form a serles of furrows or corrugatlons 1n thework.

A still'further object of the Ainvention is l the provision of a leprovided Awith teeth of special arrangement so that shears and similartools may be filed with great accuracy and facility.

ther objects and advantages of the inll vention will become apparent asthe description progresses.

In the accompanying drawing forming a part of this specification and inwhich like numerals are employed to designate correl. sponding partsthroughout `the same:

Figure 1 is a top plan view of a tile constructed in accordance with myinvention,

Figure 2 is a top plan view showing my improved file in operativeposition in association with a shear blade and diagrammaticallyillustrating the usual operation of a common form of file, and *yFigure, 3 is an enlarged fragmentary side elevational view of the file.

l. The file structure forming the subject matter of this, application isparticularly devised for filing the beveled cutting edge of vshearblades and similar tools. s is well known in the art, it is desirablewhen filing shears, to provide a plurality of fine evenly spacedcorrugations or furrows so as to increase the eliicient use of theshears. With the common forms vof files -noW usually emplayed forthispur ose, the filing or dress- 4o mg operation must e started from theouter end or point of the Ishear blade, due to the fact that the usualfile has a tendency to draw or feed to the left, so that the blade isfiled from the'point of the blade to the hand dle end thereof. Attentionis also invited to the fact that the common forms'offiles will not formtrue corrugations as the structure is Vusually arran ved so that theteeth extend in diverging allgnment and, therefore,

' sired effect. l

Referring to the drawing, wherein for. the purpose of illustration isshown the preferred embodiment of my invention, the nu- Il meral 10generally indicates the file body or shank provided atthe heelend with atapered tang 11, this tang being rovided for convenient attachment of ahan le. The faces of the file shank 10 are provided with 'diagonalintersecting grooves or lcuts arrangedl in a particular manner vto formaligned cutting teeth barbs. The cuts are of uneven de th so as to causethe file to nori mally fee or draw to the right, so that the shearbladindicated in Fi ure 2, may be suitably filed from the han le endtoward thgNpomted extremity.

ith this in mind, itl will be noted that the first or over cut 12 isformed on the faces ofthe file body 10 at an angle of 55 as shown toadvantage in Figure 1. The upper cut 1 3 is then formed at an angle of65 and is of deeper formation. This particular arrangement of the cutsor grooves 12 and 13 will form cutting teeth or barbs of. lozenge orrhombus formation, arranged in straight alignment at a slight angularinclination to the longitudinal axis of the shank. The provision of thedeeper upper or second cut partiall fills up the first cut and willcause the fi e to feed slightly toward the right during its operation soas to facilitate the dressinl of the work. Particular attention is caled to the fact that the first cut extends from the toe end of the filebody toward the tang, while the second cut extends from the tang towardthe toe of the body. This arrangement lof the cuts also tends to feedthe file to the right.

With articular reference to Figure 2 of the drawlng, the numeral 14generally desi gnates ya conventional type of shear blade having abeveled cutting edge 15. Arranged in a diagonal position transversely ofthe'shear -blade adjacent the enlarged end thereof is shown my improvedfile structure 10 in operative position. By reciprocating the file overthe cutting edge of the blade, the corrugations 16 are formed thereonand the'file will naturally have a tendency to feed to the lright or thepointed end of the blade. At the opposite end of the shear blade 14.1have conventionally illustrated al common fOlfm; of file 17 shownprovided with diagonal i ersectng grooves at angles of 45 and l0 thefilino` operation does not producethe de-f'.

f This type of file, While forming a faint on the beveled edge of theblade will ln'ot'forrn the clear cut corrugations desirable,

ing of the blades and the formation of spaced corrugations or furrowsdesirable in this type of im lement.

In practice, 1t will be readily ascertained' that the special form oflile disclosed in the present application will materially facilitate thedressing operation of shears and similar tools so that the work may beaccomplished more rapidly and in a more efficient and superior manner. A

It is to be understood that the form of my invention herewith shown anddescribed l1s to be taken as the preferred exam le of the same,"

`and a tang,

and that the same is suscepti le of I modification as to its shape andsize without y departing from the spirit of the invention or the scopeof the subjoined claim.

Having thus described my invention, I claim: A corrugating filecomprising a flat body the body having angular parallel first cutsformed in the faces of the body at an angle of substantially fifty-fivedegrees extending from the toe of the body toward the tang, and angularintersecting second cuts formed on the faces over the first cutsextending from the tang toward the toe of the body at an angle ofsubstantially sixtyve degrees, said second cuts partially iilling in therst cuts, whereby the second cuts will draw the file in a right handdirection. In testimony whereof I ailix my si ature.

HENRY B. WO CK.

